Global sea levels may rise faster than previously expected, a new study suggests. The reason is that warming oceans appear to be melting Antarctic ice shelves from below much more rapidly than expected.

Ice shelves, which are extensions of gigantic glaciers that float on the water surface, act like buttresses that slow the flow of gigatons of ice into the sea. Now, researchers in Norway have discovered that long, channel-like grooves on the underside of these ice shelves can trap relatively warm ocean water. This sharply increases local melting.

The study has global implications. If Antarctic ice shelves thin and weaken, the downhill journey of the ice behind them can accelerate, fast-forwarding the process in which huge amounts of ice cascade into the ocean, causing sea levels worldwide to rise far faster than currently projected.

This dynamic has already been observed elsewhere in Antarctica. The Intergovernmental Panel on Climate Change (IPCC) has flagged polar ice shelf instability as a major but poorly understood risk factor that could lead to sea level rise that is far more rapid and severe than most current models predict.

For 350 million years, ammonites were the resilient masterpieces of the ancient seas. They survived the Great Dying of the Permian-Triassic, an event that wiped out 96% of marine life, only to vanish during the end-Cretaceous extinction that claimed the dinosaurs. Meanwhile, their less-diverse cousins, the nautiloids, sailed through the catastrophe and still inhabit our oceans today.

Why did the invincible ammonites fail while the nautiloids endured?

J. Craig Venter, the genomicist whose work redrew the architecture of modern biology, died on 29 April 2026 in San Diego at the age of 79, following complications from treatment of a recently diagnosed cancer. Brain Health, a new peer-reviewed journal launched today by Genomic Press, publishes in its inaugural issue a scientific tribute by Dr. Julio Licinio that foregrounds a part of Venter’s legacy that other obituaries have understandably treated as background: his earliest major methodological breakthrough emerged at the National Institute of Neurological Disorders and Stroke, where he pioneered the expressed sequence tag as a route to rapidly identifying brain-expressed genes. The tribute traces an arc from that neuroscience starting point through the first complete bacterial genome, the parallel pursuit of the human sequence, large-scale ocean metagenomics, and the construction of the first cell controlled by a chemically synthesized genome.

A new study published in the journal npj Climate and Atmospheric Science, shows that electronically tagged sharks can serve as mobile sensors, collecting ocean climate data in regions that are difficult to observe using conventional methods.